M4 Barrels

Always Be Field Ready

Reliable Replacement Barrels

Military-grade barrel production for US military and Allied forces is a key operation of our business. Specializing in 5.56 NATO chambering and rifling, our manufacturing process and facility allows for high-volume production of M4 replacement barrels.

Profile: Government M4 Carbine
Length: 14.5 in (36.83 cm)
Twist: 1-7
Muzzle Thread: 1/2-28
Exterior Finish: Phosphate
Interior Finish: Chrome
Gas Block Diameter: 0.75 in (1.905 cm)
Gas Block Journal Length: A1 / A2
Quality Control

Valor controls every aspect of barrel production:

  • Material selection
  • Blank Preparation
  • Drill / Ream / Rifle
  • Stress Relief
  • Profile
  • Chambering
  • Chrome per AMS-QQ-C-320, Class 2
  • Phosphate per MIL-DTL-16232, Type 2
  • Proof Firing and Inspection
  • Final Assembly
  • Test Shooting (Lot Acceptance)

We work with trusted US based partners to source MIL-spec assembly components including barrel extensions and front sights.


We can manufacture barrel blanks up to 30” in length and 2” in diameter, allowing for production of multiple calibers. All barrels feature a proprietary chrome plating and phosphate treatment. We also provide engineering expertise to develop custom barrel profiles for customers.